A motor shaft with an independent breathing and pressure relief structure

Abstract

The utility model discloses a motor shaft with an independent breathing pressure relief structure, which relates to the technical field of motors, and is intended to solve the problems of repeated positive and negative pressures generated during the operation of existing motors, gas pressure breaking through the weak points of the motor's seal, causing the motor's seal to fail, moisture in the air entering or the motor being used in environments such as wading or rainy days, and the risk of failure. The outer shaft kit is installed on the outside of one end of the motor shaft, the outer shaft kit is installed on the inner wall of one of the rotating bearings, a sleeve cavity is provided inside the outer shaft kit, a mounting groove is provided on one side of the outer wall of the outer shaft kit, and the mounting groove is formed integrally with the outer shaft kit, a flow cavity is provided between the outer shaft kit and one end of the motor shaft, a waterproof and breathable connecting terminal piece is provided above the mounting groove, and one end of the waterproof and breathable connecting terminal piece is snap-connected to the mounting groove.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor shaft with an independent breathing and pressure relief structure. Background Art

[0002] The brushless DC motor consists of a motor body and a driver, and is a typical mechatronics product. The stator winding of the motor is mostly made into a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. The rotor of the motor is attached with a magnetized permanent magnet. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver is composed of power electronic devices and integrated circuits, etc. Its functions are: receiving the start, stop, and brake signals of the motor to control the start, stop, and brake of the motor; receiving the position sensor signal and the forward and reverse signals to control the on and off of each power tube of the inverter bridge to generate continuous torque; receiving the speed command and speed feedback signal to control and adjust the speed; providing protection and display, etc.

[0003] For example, the announcement number is CN212412949U, and the name of the Chinese authorized patent is (anti-seismic motor shaft), which includes: two shock-absorbing devices nested on both sides of the motor shaft, each of which includes a bearing nested on the motor shaft, a fixing ring arranged outside the bearing and coaxial with the bearing, and an elastomer arranged between the bearing and the fixing ring, and a closed annular cavity is arranged inside the elastomer along the annular direction, and the annular cavity is filled with an inert gas; a shock-absorbing device is added to the motor shaft to reduce the vibration of the motor shaft when it runs at high speed and increase the service life of the motor shaft; the inert gas filled in the annular cavity of the elastomer expands due to the heat generated by the friction of the bearing, so that the fixing ring fits more closely with the inner wall of the motor housing, thereby improving the tightness of the device, further reducing the vibration of the motor shaft when it runs at high speed and increasing the service life of the motor shaft; the structure is simple and easy to manufacture and produce

[0004] However, the existing motors generate cyclic positive and negative pressures during operation, and the gas pressure will break through the weak points of the motor's seal, causing the motor's seal to fail. There is a risk of motor failure when moisture in the air enters or the motor is used in environments such as wading or rainy days. Therefore, it does not meet existing needs. We have proposed a motor shaft with an independent breathing and pressure relief structure. Utility Model Content

[0005] The purpose of the utility model is to provide a motor shaft with an independent breathing and pressure relief structure to solve the problems of the repetitive positive and negative pressures generated during the operation of the existing motor proposed in the above-mentioned background technology, the gas pressure breaking through the weak points of the motor's seal, causing the motor's seal to fail, and the risk of motor failure due to the entry of moisture in the air or when used in environments such as wading, rainy days, etc.

[0006] To achieve the above object, the utility model provides the following technical solution: a motor shaft with an independent breathing pressure relief structure, comprising: a motor rotor and a motor shaft body, wherein the motor rotor is rotatably connected to the motor shaft body through a rotating bearing, and two rotating bearings are provided;

[0007] Also includes:

[0008] An outer shaft kit is installed on the outside of one end of the motor shaft body, the outer shaft kit is installed on the inner wall of one of the rotating bearings, a sleeve cavity is arranged inside the outer shaft kit, a mounting groove is arranged on one side of the outer wall of the outer shaft kit, and the mounting groove is formed integrally with the outer shaft kit, a flow cavity is arranged between the outer shaft kit and one end of the motor shaft body, a waterproof and breathable connecting terminal piece is arranged above the mounting groove, and one end of the waterproof and breathable connecting terminal piece is snap-connected with the mounting groove.

[0009] Preferably, a connecting head is provided at the other end of the waterproof and breathable connecting terminal piece, a conveying pipe is provided above the connecting head, and a breathable mechanism is provided at one end of the conveying pipe.

[0010] Preferably, both ends of the delivery pipeline are detachably connected to a connector and a venting mechanism respectively.

[0011] Preferably, outer walls at both ends of the motor shaft are provided with threaded walls, and the threaded walls are integrally formed with the outer walls at both ends of the motor shaft.

[0012] Preferably, an inner cavity is provided inside the motor rotor, and a motor stator is provided inside the inner cavity.

[0013] Preferably, the motor stator is fixedly connected to the middle position of the motor shaft.

[0014] Preferably, a hole groove is provided inside the other end of the motor shaft, and a connecting wire is provided inside the hole groove.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model has an outer shaft kit arranged at one end of the motor shaft body, and a waterproof and breathable connecting terminal piece, a connector, a conveying pipe and a breathable mechanism inside the motor rotor. One end of the waterproof and breathable connecting terminal piece is installed inside the mounting groove, and then the connecting head conveying pipe and the breathable mechanism are connected in sequence. The high-pressure or low-pressure gas generated by the changing internal air pressure can be effectively conveyed through the flow cavity between the outer shaft kit and the motor shaft body, effectively avoiding the cyclic positive and negative pressures generated during the operation of some motors. The gas pressure will break through the weak points of the motor's seal, causing the motor's seal to fail. When moisture in the air enters or the motor is used in environments such as wading or rainy days, there is a risk of failure of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the motor rotor of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of one side of the motor rotor of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of a partial side of the outer shaft kit of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the other side of the outer shaft kit of the utility model;

[0022] In the figure: 100, motor rotor; 101, inner cavity; 102, motor stator; 103, hole groove; 104, connecting wire; 200, motor shaft; 201, threaded wall; 203, flow cavity; 204, installation groove; 205, waterproof and breathable connecting terminal; 206, connector; 207, conveying pipeline; 208, ventilation mechanism; 300, outer shaft kit; 301, sleeve cavity; 400, rotating bearing. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-5 The utility model provides an embodiment: a motor shaft with an independent breathing pressure relief structure, comprising: a motor rotor 100 and a motor shaft body 200, the motor rotor 100 is rotatably connected to the motor shaft body 200 through a rotating bearing 400, and two rotating bearings 400 are provided;

[0025] Also includes:

[0026] The outer shaft kit 300 is installed on the outside of one end of the motor shaft body 200. The outer shaft kit 300 is installed on the inner wall of a rotating bearing 400. A sleeve cavity 301 is arranged inside the outer shaft kit 300. A mounting groove 204 is arranged on one side of the outer wall of the outer shaft kit 300, and the mounting groove 204 is formed integrally with the outer shaft kit 300. A flow cavity 203 is arranged between the outer shaft kit 300 and one end of the motor shaft body 200. A waterproof and breathable connecting terminal piece 205 is arranged above the mounting groove 204, and one end of the waterproof and breathable connecting terminal piece 205 is snap-connected with the mounting groove 204.

[0027] See also Figure 2 A connector 206 is disposed at the other end of the waterproof and breathable connecting terminal piece 205 , a delivery pipe 207 is disposed above the connection head 206 , and a breathable mechanism 208 is disposed at one end of the delivery pipe 207 .

[0028] See also Figure 2 The two ends of the delivery pipeline 207 are detachably connected to the connector 206 and the air-permeable mechanism 208 respectively.

[0029] See also Figure 1 The outer walls at both ends of the motor shaft 200 are provided with threaded walls 201, and the threaded walls 201 are formed integrally with the outer walls at both ends of the motor shaft 200, the interior of the motor rotor 100 is provided with an inner cavity 101, the interior of the inner cavity 101 is provided with a motor stator 102, the motor stator 102 is fixedly connected to the middle position of the motor shaft 200, the interior of the other end of the motor shaft 200 is provided with a hole groove 103, and the interior of the hole groove 103 is provided with a connecting wire 104.

[0030] Working principle: install the outer shaft kit 300 on the outside of one end of the motor shaft body 200, and then install the two rotating bearings 400 on the other end of the motor shaft body 200 and the outside of the outer shaft kit 300, and then install one end of the waterproof and breathable connecting terminal piece 205 inside the mounting groove 204, and then connect the connector 206, the delivery pipe 207 and the breathable mechanism 208 in sequence, which can effectively transport the high-pressure or low-pressure gas generated by the internal changing air pressure through the flow cavity 203 between the outer shaft kit 300 and the motor shaft body 300, and the waterproof and breathable connecting terminal piece can effectively prevent water from entering and avoid damage to internal components.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A motor shaft with an independent breathing pressure relief structure, comprising a motor rotor (100) and a motor shaft body (200), wherein the motor rotor (100) is rotatably connected to the motor shaft body (200) via a rotating bearing (400), and two rotating bearings (400) are provided; Features: Also includes: An outer shaft kit (300) is mounted on the outside of one end of the motor shaft body (200), the outer shaft kit (300) is mounted on the inner wall of one of the rotating bearings (400), a sleeve cavity (301) is provided inside the outer shaft kit (300), a mounting groove (204) is provided on one side of the outer wall of the outer shaft kit (300), and the mounting groove (204) and the outer shaft kit (300) are formed in one piece, a flow cavity (203) is provided between the outer shaft kit (300) and one end of the motor shaft body (200), a waterproof and breathable connecting terminal piece (205) is provided above the mounting groove (204), and one end of the waterproof and breathable connecting terminal piece (205) is snap-connected to the mounting groove (204).

2. The motor shaft with an independent breathing and pressure relief structure according to claim 1, characterized in that: The other end of the waterproof and breathable connecting terminal piece (205) is provided with a connecting head (206), a conveying pipe (207) is provided above the connecting head (206), and a breathable mechanism (208) is provided at one end of the conveying pipe (207).

3. The motor shaft with an independent breathing and pressure relief structure according to claim 2, characterized in that: Both ends of the delivery pipeline (207) are detachably connected to the connector (206) and the air permeability mechanism (208), respectively.

4. The motor shaft with an independent breathing and pressure relief structure according to claim 1, characterized in that: The outer walls at both ends of the motor shaft body (200) are both provided with threaded walls (201), and the threaded walls (201) and the outer walls at both ends of the motor shaft body (200) are formed in one piece.

5. The motor shaft with an independent breathing and pressure relief structure according to claim 1, characterized in that: An inner cavity (101) is provided inside the motor rotor (100), and a motor stator (102) is provided inside the inner cavity (101).

6. The motor shaft with an independent breathing and pressure relief structure according to claim 5, characterized in that: The motor stator (102) is fixedly connected to the middle position of the motor shaft (200).

7. The motor shaft with an independent breathing and pressure relief structure according to claim 1, characterized in that: A hole groove (103) is provided inside the other end of the motor shaft body (200), and a connecting wire (104) is provided inside the hole groove (103).

Images